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Multimedia Joint Viewing and Teleoperation is a new service for highspeed networks. It allows physically separated users to work in a collaborative fashion with documents and applications. It is however not a cooperative application but a system level service exporting the functionality of applications to many workstations. Keyword Codes: C.2.4; D.4.4; H.5.1 Keywords: Distributed Systems; Communications Management; Multimedia Information Systems 1. Introduction Advances in communications and computer technology provide the technical foundation to integrate digital audio and video into today's distributed information processing systems. This is of great advantage for many application areas, especially for those, where users communicate and cooperate to work on a common task. Joint Viewing (JV) systems are considered to be the basis for many applications in the field of real-time computer-supported cooperative work [ElGi91], such as desktop conferencing [Cr90], joint-editing [FiKr88]...

Recent technology advances have made computer-based multimedia cooperation among distributed users feasible. Joint-Viewing (JV) is one such proposed cooperation concept. Correct interaction in it requires synchronization on various levels. In this paper we focus on synchronization aspects on the data stream level. We present several JV scenarios and state for each of these requirements concerning interstream synchronization. Then we introduce basic abstractions of a synchronization scheme, which is powerful enough to model a variety of JV configurations with their various synchronization needs. The presented scheme is based on the notion of a referencing system, which consists of a set of logical clocks, each defining a different time zone in the referencing system. Logical clocks provide timing information for input and output devices, which are used to produce and consume data in a synchronized fashion. 1 Introduction Advances in communications and computer technology provide the te...

this paper, we connect the two fields together by taking the reader on a tour of CSCW applications and investigating their use in education.